Common Stock Repurchase Program	6 Months Ended
Jun. 30, 2013
Common Stock Repurchase Program	Common Stock Repurchase Program On October 27, 2011, we announced that our Board of Directors approved a stock repurchase program pursuant to which we may repurchase up to $150.0 million of common stock. Purchases under the stock repurchase program may be made from time to time in the open market. During the six months ended June 30, 2013, we repurchased approximately 2.7 million shares of our common stock at an average price of $34.95 per share, including commissions, for an aggregate purchase price of approximately $95.1 million. All repurchased shares were retired. The common stock retirements reduced additional paid-in capital by approximately $24.5 million and increased accumulated deficit by $70.6 million. No shares are available for repurchase as we completed the repurchases under this program as of June 30, 2013.

Common Stock Repurchase Program

On October 27, 2011, we announced that our Board of Directors approved a stock repurchase program pursuant to which we may repurchase up to $150.0 million of common stock. Purchases under the stock repurchase program may be made from time to time in the open market. During the six months ended June 30, 2013, we repurchased approximately 2.7 million shares of our common stock at an average price of $34.95 per share, including commissions, for an aggregate purchase price of approximately $95.1 million. All repurchased shares were retired. The common stock retirements reduced additional paid-in capital by approximately $24.5 million and increased accumulated deficit by $70.6 million. No shares are available for repurchase as we completed the repurchases under this program as of June 30, 2013.